Aquaculture vessels represent an important direction in the development of modern marine fisheries, and the transport characteristics of particles within rearing tanks are of great significance for assessing tank water environments. In this study, the transport behavior of soluble particles in a vortex flow field was investigated based on the Euler–Lagrangian computational framework. Considering the effects of inflow and outflow, a hybrid modeling approach was adopted, employing LES (Smagorinsky model) in the horizontal direction and a RANS model in the vertical direction, thereby constructing a numerical rearing tank. The Langevin model was applied to simulate the motion and settling of particles in vortex flows.The study examined particle transport characteristics under different flow conditions, analyzing the variation of maximum discharge rate and residence time with inflow angle, inflow discharge, particle density, and solubility. Results show that when the inflow angle increases from 0°to 60°, the maximum discharge rate of particles decreases from 74% to 37%. As the inflow discharge rises from 0.25 m³/s to 1.25 m³/s, the maximum discharge rate increases from 64% to 98%. The transport characteristics of commonly soluble particles were found to be largely similar. However, with further increases in particle solubility, the maximum discharge rate decreased by 12%.These findings indicate that, under a given inflow discharge, adjusting inflow angle and particle density can effectively enhance the maximum discharge rate of particles, whereas particle solubility exerts a suppressing effect on discharge performance.